@book{37150,
	author = {Rankama, Kalervo and Sahama, TH. G},
	title = {Geoquímica},
	publisher = {Aguilar, },
	year = {1962.},
	address = {Madrid : },
	edition = {2a. ed},
	note = {Incluye indice de autores.Incluye indice de materias}
}